Was nodding out after a party (I was like 19 or something) and was sitting on my couch watching TV with a buddie and this girl he brought to the party, next thing you know I feel a hand unzip my pants and she was on her hands and knees in front of me getting it doggie style wanting to give me a BJ!!! So, I woke up and got a fantastic BJ out of it.
I am in a committed relationship and would never share and she feels the same way, so not something that I'd participate in but swinging and multiple partners is not that uncommon, hell they have a TV show on a national network about swingers.